WATCH: Taylor Swift performs with Carly Simon in Massachusetts

3 years ago

Taylor Swift is performing with a '70s music legend. At her Foxboro, Massachusetts show Saturday night, the country-pop superstar welcomed Carly Simon to join her in singing the 1972 hit "You're So Vain."

Following the show Swift tweeted her excitement over performing with Simon, calling the experience "unreal." Taylor added that she "could not possibly look up to her more."

Got to sing 'You're So Vain' with Carly Simon at Gillette Stadium tonight!!!!! Unreal. I could not possibly look up to her more.